My server crashed and wont reopen

Alright so i placed down a mob spawner from the mod with the syringes i think its called FRtools or something like that and i put in a zombie villager syringe in the mob spawner and it crashed my game and when i try to launch the server it always crashes when i try to join it it crashes again and its always the same line of code and i was wondering if there was a way to fix it because me and my friends have a a lot of progress.

"Caused by: java.lang.IllegalStateException: The mob spawn amounts list for mob minecraft:zombie_villager (the default list) is the wrong size. Instead of 3 elements, it contained 0" is the line of code that catches my eye and i think that is the problem

ill put the whole line of code in here if you guys need it i just really want to fix my server without having to restart from scratch

Quote from Roman

Try removing that mod

how do i do that on aternos because im playing stoneblock 2 and how do i do that?

Quote from Roman

Try to reinstall the server

once again how?

Quote from Roman

Hit the reinstall button on the options page.

Take a backup before on the backups page.

im on it